Brush holder and method of making the same



Dec. 30, 1924- 1,521,012 J. S. DEAN BRUSH HOLDER AND METHOD OF MAKNG THE SAME B 4 fl* l. N

ATTORNEY Fig.

the blank 3 are provid d. with ontw proiectino: tongues. indicated es a 7, and with in illy orte. jacent to the bottom edc tongues 7 are bent ontw dotted lines 10 to torni wardly and parallel to the s dotted lines 12. to torni lian The rear element 2. of traine, is formed in a manner sub1 similar to the front elem/ei i (Fig. bent alon forni substantially i f f tending side walls 16 connected l u wall 17. The ends ot the blank 14; e vided with outwardly projeeti indicated as whole :it 18. an d inwartL u tending slits 19 adjacent to the bottom ot the tongues 18 which 'torni tongues 20. The tongues 1S are bent outwardly, in opposite directions from each other along' the dotted lines 21 to forni ears 22 and. rearwardly along the dotted lines 2?; and parallel to the side walls 16 to form flanges 24, (Fig. 2). The lower portion of the rear wall 17 is bent outwardly along` the dotted line 25 to `form a rearwardly extend: flange 26 to which the rear end ot a brush spring. not shown. may be secured T he front and rear elements 1 and 2. thus formed. are assembled with the ears 11 and 22 in abutting and the tongues 9 and 20 in lapped relation. and are spot-welded or otherwise suitably secured together. as indicated at 27. The tongues 9 and 2O may be slightly offset to permit the walls 5 and. 16 of the members 1 and 2 respectively to abut and to lie llush with each other. l

A sheet metal blank 28 (Fig. 7) is suitably formed with a pluralityof relativelyY wide end portions 29 connected by a relativelv narrow portion or strap 30. The end portions 29 are cut. as indicated at 31 to form centrally disposed ears 32 and sido portions 33. The ears 32 and the side por tion 33 are bent upwardly along the dotted lines 34. The ears 32 are bent vertically upwards and the side portions 33 are bent upwardly and outwardly at an angle, as is illustrated in Fig. 3 ot the drawings. The end portions 29 are further bent along the dotted lines 35 to 1form flanges 36.

The member thus formed is disposed isversely with respect to the brushholder .ne and. adjacent to the juncture of thil cements 1 and. 2 2). The ears 32 are u tl, as indicated at 37, to the overlapped ues 9 ancL 2O ot the elements 1 and 2 resi ectiwely7 and at the same time securing the tongues together. The flanges 36 are w to the tongues l?? sind 24 respectively v icated at 3S, thus securely tying to` ively laterle'l. The end of the portion 411 is formed with an upwardly .f :urved portion #15,

(Fig. 1.)

The element thus formed is arranged in position with the portion 4() parallel to the 'front wall 6 of the brushholder and spaced therefrom.. and it constitutes the rear wall of the hrushbox. The ears 44 oic the portion are welded to the Iside walls 5, as at 16. and this arrangement additionally braces the structure against lateral stresses. The narrow portion 41 extends rearwardly and is welded to the strap 3() and to the reni wall 17 of the element 2. as indicated at 47 and 48 respectively.

The extensions formed by the abutting ears 11 and 22- and the flanges 13 and 24 respectively. are adapted to be engaged by the brushholder supporting posts 419, indicated by dotted lines in Fig. 1. The posts are provided at their lower extremities with diametricallv extending slots 50 within which the abutting ears 11 and 22 are suitablv secured.

means of this construction, I obtain a hrushholder that is relatively light in weight and rigid in construction, and one that may he manufactured at a minimum of labor and expense. Furthermore. it will be obser ved that, in a brushholder of this construction, the relatively high front wall 6 oi the brushbox will extend above the top of a brush mounted therein and by reason et' the usual angular disposition of the hrushholder with respect to a eommutator cylinder. the 'front wall will consequently overhang the brush and will prevent foreign m utter trom accumulating in pockets formed by the brush and the walls of the box. Also, by reason ol the relatively low rear wall 40, foreign matter cannot collect on the top of the brush and similarly work down the rear surface of the brush. The comparatively low rear Wall of the brushhox permits the brush finger 53 to have ample vertical movenient.

l claim as my invention:

l. A pressed steel brushholder comprising a plurality of separately formed main elements each of Which is provided With a plurality of tongue members and a plurality of outwardly extending ear members, said elements being so arranged in end-toend relation that the tongue and ear members of one element relatively o-verlap and abut the correspondingmembers of the other element.

2. A pressed steel brusliholder comprising a plurality of separately formed elements each of which is provided With a plurality of tongue members and a plurality of outwardly extending ear members, said elements being so disposed in end-to-end relation that the tongue and ear members ot one element respectively overlap and abut the corresponding members of the other element, and a plurality of longitudinal and transverse reinforcing members secured to said elements.

3. The method of making a pressed steel brushholder Which comprises, forming front and rear frame elements from sheet metal blanks, each of said elements being formed with a plurality7 oli' coresponding tongue members and a plurality of laterally extending ear members, of forming a plurality of reinforcing members from sheet metal blanks, so disposing said elements in end-toend relation that the corresponding tongue and ear members et each element respectively lap and abut each other, disposing the reinforcing members in position to brace said elements laterally and longitudinally, and Welding the respective portions together.

4. A sheet-metal brushholder having a brushbox comprising a relatively high continuous `trout Wall having integral back- 1vardly bent extensions constituting side Walls, a relatively low-cut rear Wall having integral backwardly bent tabs secured to said side walls, and a supporting frame for the rear portions of said side-Wall extensions.

5. A sheet-metal brushholder having a brushboX comprising a Wall having integral bent extensions constituting side Walls, a second Wall having integral bent tabs secured to said side Walls, and a supporting frame for the end portions of said side-Wall extensions.

ln testimony whereof, I have hereunto subscribed my name this 22nd day of 0ctober 1920.

JOHN S. DEAN. 

